Malnutrition refers to deficiencies, excesses, or imbalances in a person’s intake of energy and/or nutrients. The term malnutrition addresses 3 broad groups of conditions: Show
There are 4 broad sub-forms of undernutrition: wasting, stunting, underweight, and deficiencies in vitamins and minerals. Undernutrition makes children in particular much more vulnerable to disease and death. Low weight-for-height is known as wasting. It usually indicates recent and severe weight loss, because a person has not had enough food to eat and/or they have had an infectious disease, such as diarrhoea, which has caused them to lose weight. A young child who is moderately or severely wasted has an increased risk of death, but treatment is possible. Low height-for-age is known as stunting. It is the result of chronic or recurrent undernutrition, usually associated with poor socioeconomic conditions, poor maternal health and nutrition, frequent illness, and/or inappropriate infant and young child feeding and care in early life. Stunting holds children back from reaching their physical and cognitive potential. Children with low weight-for-age are known as underweight. A child who is underweight may be stunted, wasted, or both. Inadequacies in intake of vitamins and minerals often referred to as micronutrients, can also be grouped together. Micronutrients enable the body to produce enzymes, hormones, and other substances that are essential for proper growth and development. Iodine, vitamin A, and iron are the most important in global public health terms; their deficiency represents a major threat to the health and development of populations worldwide, particularly children and pregnant women in low-income countries. Overweight and obesity is when a person is too heavy for his or her height. Abnormal or excessive fat accumulation can impair health. Body mass index (BMI) is an index of weight-for-height commonly used to classify overweight and obesity. It is defined as a person’s weight in kilograms divided by the square of his/her height in meters (kg/m²). In adults, overweight is defined as a BMI of 25 or more, whereas obesity is a BMI of 30 or more. Overweight and obesity result from an imbalance between energy consumed (too much) and energy expended (too little). Globally, people are consuming foods and drinks that are more energy-dense (high in sugars and fats), and engaging in less physical activity. Diet-related noncommunicable diseases (NCDs) include cardiovascular diseases (such as heart attacks and stroke, and often linked with high blood pressure), certain cancers, and diabetes. Unhealthy diets and poor nutrition are among the top risk factors for these diseases globally. In 2014, approximately 462 million adults worldwide were underweight, while 1.9 billion were either overweight or obese. In 2016, an estimated 155 million children under the age of 5 years were suffering from stunting, while 41 million were overweight or obese. Around 45% of deaths among children under 5 years of age are linked to undernutrition. These mostly occur in low- and middle-income countries. At the same time, in these same countries, rates of childhood overweight and obesity are rising. Every country in the world is affected by one or more forms of malnutrition. Combating malnutrition in all its forms is one of the greatest global health challenges. Women, infants, children, and adolescents are at particular risk of malnutrition. Optimizing nutrition early in life—including the 1000 days from conception to a child’s second birthday—ensures the best possible start in life, with long-term benefits. Poverty amplifies the risk of, and risks from, malnutrition. People who are poor are more likely to be affected by different forms of malnutrition. Also, malnutrition increases health care costs, reduces productivity, and slows economic growth, which can perpetuate a cycle of poverty and ill-health. On 1 April 2016, the United Nations (UN) General Assembly proclaimed 2016–2025 the United Nations Decade of Action on Nutrition. The Decade is an unprecedented opportunity for addressing all forms of malnutrition. It sets a concrete timeline for implementation of the commitments made at the Second International Conference on Nutrition (ICN2) to meet a set of global nutrition targets and diet-related NCD targets by 2025, as well as relevant targets in the Agenda for Sustainable Development by 2030—in particular, Sustainable Development Goal (SDG) 2 (end hunger, achieve food security and improved nutrition and promote sustainable agriculture) and SDG 3 (ensure healthy lives and promote wellbeing for all at all ages). Led by WHO and the Food and Agriculture Organization of the United Nations (FAO), the UN Decade of Action on Nutrition calls for policy action across 6 key areas:
WHO aims for a world free of all forms of malnutrition, where all people achieve health and wellbeing. According to the 2016–2025 nutrition strategy, WHO works with Member States and partners towards universal access to effective nutrition interventions and to healthy diets from sustainable and resilient food systems. WHO uses its convening power to help set, align and advocate for priorities and policies that move nutrition forward globally; develops evidence-informed guidance based on robust scientific and ethical frameworks; supports the adoption of guidance and implementation of effective nutrition actions; and monitors and evaluates policy and programme implementation and nutrition outcomes. This work is framed by the Comprehensive implementation plan on maternal, infant, and young child nutrition, adopted by Member States through a World Health Assembly resolution in 2012. Actions to end malnutrition are also vital for achieving the diet-related targets of the Global action plan for the prevention and control of noncommunicable diseases 2013–2020, the Global strategy for women’s, children’s, and adolescent’s health 2016–2030, and the 2030 Agenda for sustainable development.
Malnutrition means "poor nutrition" which can be caused by undernutrition or overnutrition. The term is most commonly used to describe undernutrition, which is the focus here. Please see obesity for more information about overnutrition. A balanced diet should provide enough nutrients such as calories, protein and vitamins, to keep you healthy. Without this, you may not be getting all the nutrients you need and this can lead to malnutrition. Malnutrition can result in unplanned weight loss, a low body mass index (BMI) and vitamin and mineral deficiencies. This can leave you feeling tired, weak and affect your ability to recover from an illness. In the UK, evidence suggests that:
Conditions that can cause malnutritionCertain medical conditions can cause increased requirements or lead to your body being unable to absorb or use nutrients properly. These may include:
Sometimes taking multiple medications or certain types of medication may also increase your risk of developing malnutrition. Always check your medicines information and speak to your prescriber for advice if you have a concern. Do not stop taking your medication without advice from a health care professional. Other causes of malnutritionMalnutrition can also be caused by physical issues, social issues and ageing. Physical issuesPhysical issues can also contribute to malnutrition. For example:
Social factorsSocial issues that can contribute to malnutrition include:
AgeingOlder adults are particularly vulnerable to malnutrition because of physical, psychological and social factors, and because the risk of having one or more medical conditions is higher. Signs and Symptoms of MalnutritionMalnutrition can be difficult to recognise and can happen very gradually, which can make it very difficult to spot in the early stages. Common signs and symptoms to watch out for include:
You should see your GP if you have had any of the above symptoms and have noticed a drop in weight or lost weight without trying.
A health care professional can assess you for malnutrition using a screening tool such as ‘Malnutrition Universal Screening Tool’ (‘MUST’). This tool assesses individuals as being at low, medium or high risk of malnutrition. Screen yourself for malnutrition Treating malnutritionIf you have lost weight or your appetite is poor, making simple changes to your meals, snacks and drinks may help. Choosing nutrient-dense food and drinks can help improve your calorie intake without having to make the portion size much bigger. This advice may not be suitable for everyone, especially those with other conditions such as diabetes or swallowing difficulties. Ask your doctor, dietitian or nurse for further advice if you are unsure.
The following ideas will help you to increase the amount of calories and protein in your diet:
Ideas for adding high-calorie ingredients to food and drinks are outlined in the table.
Ideas for high calorie and protein snacks include:
The British Dietetic Association (BDA) Malnutrition factsheet provides more useful practical advice. Oral Nutritional SupplementsOral nutritional supplements (often shortened to ONS) are a range of liquid and powder products that can be recommended, within certain circumstances, to help support better nutrition. These products contain calories, protein, vitamins and minerals to help increase your intake. They are designed to be taken alongside your diet and the ‘food first’ advice above to promote progress with your weight. Depending on your medical background you may have them prescribed by a dietitian or doctor, however, you can buy some products in chemists and supermarkets, such as Meritene® and Complan®. It is illegal to use or share products prescribed for another person. These products do not contain all the nutrition you need and so are not designed to replace food but complement what you can manage. A dietitian will usually assess your medical history, your nutritional needs and taste likes and dislikes before advising you on a product. ONS is clinically proven to be most helpful in a course of up to 12 weeks. Regular review is important, by the prescriber, to make sure the product is helping you in the right way and helping you meet your treatment goals. Tube feeding (enteral feeding)In certain situations, hospital admission may be required. A full assessment will be carried out by all or some of the following people:
It may be considered necessary due to symptoms that you are experiencing to have what we call a “feeding tube” placed. There are several types of tubes and the choice is dependent on your diagnosis and symptoms. These include:
There are various other tubes but these are the most common types. On occasions, depending on your condition, alternative routes of nutrition may be considered. Time spent in hospital will depend on your condition and the cause of poor nutrition. In many cases, it is possible to return home while still receiving treatment to improve your nutritional state. |